method

count_by_sql

Importance_1
v1.2.6 - Show latest stable - 1 note - Class: ActiveRecord::Base
count_by_sql(sql) public

Returns the result of an SQL statement that should only include a COUNT(*) in the SELECT part. 

  Product.count_by_sql "SELECT COUNT(*) FROM sales s, customers c WHERE s.customer_id = c.id"
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February 17, 2009
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If you want to avoid SQL...

…you’re probably looking for http://apidock.com/rails/ActiveRecord/Calculations/ClassMethods/count